Look up unary in Wiktionary, the free dictionary.
Unary may refer to:
- Unary numeral system, the simplest numeral system to represent natural numbers
 - Unary function, a function that takes one argument; in computer science, a unary operator is a subset of unary function
 - Unary operation, a kind of mathematical operator that has only one operand
 - Unary relation, a mathematical relation that has one argument
 - Unary coding, an entropy encoding that represents a number n with n − 1 ones followed by a zero
 
See also
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